Redistribution of Welding Residual Stress and its Effects on Fatigue Crack Propagation

피로균열이 진전할 때 용접잔류응력의 재분포와 그 영향

  • 이용복 (홍익대학교, 기계공학과) ;
  • 조남익 (전주공업전문대학 기계과)
  • Published : 1995.12.01

Abstract

Redistribution of residual stress and its effects during fatigue crack propagates from tensile residual stress region in weldment are investigated. Tests are performed by using welded CCT specimens of structual rolling steel (SS400) and it makes fatigue crack propagate from tensile residual stress region. For this study tension-tension loading type is selected by external loading condition and magnetizing stress indicator is used correctly to measure redistribution of residual stress according to fatigue crack growth and number of loading cycles. From this result, it is proved that redistribution of residual stress is mainly consist of residual stress released by fatigue crack growth. When fatigue crack propagates from tensile residual stress region residual stress are redistributed and it makes fatigue crack growth rate largely increase. Fatigue crack growth rate is low in case of redistributed residual stress compare with initial distributed residual stress.

Keywords

References

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